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unstable red-brown gas [CRC10]

Unlike most organic reagents, the notation Bromine fluoride has been designated to indicate a two-step reaction taking place when a mixture of two different agents, one a source of electrophilic bromine and the other of nucleophilic fluorine, is reacted with a substrate. The true molecule BrF can be prepared in situ by reaction between the corresponding elements and by reacting bromine with BrF3.  Many, but not all, reactions of [BrF] and BrF are quite similar.